Fuse plug



M. E. WINKS May .4, 1926.

FUSE PLUG Filed Jan. 6, 1921 1% /a /z f BY 15 S ATTORNEY.

CLI

UNITED STATES PA'I'Eqhiri" @Fiii MILES EDWARD W'INKS, 0F SAN JOSE, CALIFGRNIA, ASSEGNOR 0F ONE-HALF HOME-R THOMAS VVAGGONER, 0F STROII, INDIANA.

FUSE PLUG.

Application filed January G, 1921.

7'0 all 'zo/wm t 'may conce/VL.'

Be it lrnown that I, MILES EDWARD lli/Tinus, a cit-Len of the United States, residing at San J ose, in the county of Santa Clara and State of California, have invented certain new and useful Improvements in Fuse Plugs, of which the following is a specification.

The main object of this invention is th-e provision of a fuse plug having means for rapidly replacing the burnt fuse wire after a blowout, thereby possessing the quality of economy as well as that of adaptability to emergencies. By means of the new plug, a system which has ben impaired by the blowing of a fuse may be repaired in a very short time, by simply replacing the burnt wire with a new wire.

The above and other objects will become apparentin the description below, in which like-named characters of reference refer to like-named parts in the drawings.

Referring briefly to the drawings, Fig. 1 is a central longitudinal cross-sectional view of the plug` Fig. 2 is a perspective view, partly in section, of the removable cap of my plug.

Fig. 3 is a cross-sectional view on the line e-a of Fig. 1.

Fig. i is a partial elevational view on the line ln-i of Fig. 1 with the cap removed.

Fig. 5 is a cross-sectional view on the line of Fig. 1.

Referring in det-nil to the drawings, the numeral 1 represents the body of the plug, which may be made of porcelain, as usual. In the base of said body a recess 2 is provided for the secure and tight reception therein of a cap 3 having an upwardly ex tending rigid square tube 4. A post 5 of brass or the like is united to the screw shell 6 as shown, the post having rigid with the top thereof a spring or resilient clip 7. Re` silient legs 8 are provided on the clip, between which the upper end of the fuse wire 9 may be clamped and securely retained. The lower end of the wire is soldered to the inside of the tube et. In the sale of the plug, a number of caps 3 previously provided with fuse wires 9 already soldered in the tube 4 of each, are provided with each plug.

The upper portion of the body ofthe plug Serial No. 435,375.

is provided with a pair of diametrically opposed T shaped recesses extending a short distance radially into the plug body forming in effect the female elements of a bayonet loclr comprising a central open portion 10, the under out recesses 12 and the overhanging ledges 15. The fuse cap 13 is preferably made of brass, and is provided with resilient clips or ears 11 adapted to register with the recesses 12 to releasably retain the cap on the plug. In order to remove the cap, it is apparent that the latter need be turned until the ears 11 register with the recesses 10, when the cap is free to be drawn upward from the body of the plug. 'In ettaching the cap, it is also apparent that the same must be applied with the ears sliding in the recesses 10, and the cap may then be turned in either direction until the ears engage the recesses 12, by which the cap is retained by the upper eaves 15.

Therefore, assuming that the plug has been used and that the fuse wire therein has been blown out, the plug is first unsere-wed from its socket as any ordinary plug. Then the cap 13 is removed as above described, and the upper end of the wire removed from the resilient clip 7. rI lhen the cap 8 is withdrawn from the bottom, of the plug, thc lower portion of the wire coming out with the cap 3. A new cap, with fuse wire already provided on its tube 4i, is then inn serted thru the recess 3, and the upper end is forced between the legs 8 of the clip 7. Finally, the cap 13 is replaced, and the fuse is again ready for use.

In order to further insure the insulating quality of the plug, an insulating non-inflammable disc 16 is provided between the cap 13 and the upper surface of the body 1, this disc also operating to prevent the entrance of moisture and also to prevent the fuse wire from uniting with the cap at the instant of fusion, when the fuse plug is used in certain positions.

I claim:

A fuse plug comprising a hollow body composed of insulating material, ascrew shell mounted on said body, a cap covering the top of said body, a terminal cap on the bottom of said body, a post within said body uullied to the shell, said post having threads on its outer face corresponding to the tlrfeads ou the schw shell, esileut parallel lingers having a vertical channel and exlending al right angles from lhe free end ofthe posi if werd lhe interior O the body, the Corners el' saldi lingers mutually facing; each other being` reunclecl, a hollow stem, and a fusible link xed in the hollow stem and adapted to be received between the resilient lingers to 10 establish electrical connection between the shell and the terminal cap of the fuse.

lu witness wher-eef I al'lix my signature.

MILES EDV/VARI) WNKS 

